By most estimates, Mississippi is the source of 80 to 85 percent of the catfish grown and processed annually.

South Africa is Zimbabwe's main trade partner, a big investor and the source of more than 40 percent of its electricity.

Saudi Arabia is the source of only 15 percent of America's imported oil.

After several years of effort McDonald's has been able to find local sources of 95 percent of the food and materials it needs.

The United States was the source of 56 percent.

The western companies are the source of about 20 percent of the medications for eastern Germany.

This was the source of more than 40 percent of the nation's accelerated productivity growth.

Colombia is the source of 90 percent of the cocaine consumed in the United States.

And prices for oil and natural gas, the source of more than 95 percent of the country's hard currency earnings, have risen.

The lake is the source of 40 percent of Northern Ireland's drinking water.